| Author |
Message |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 5941
Reg: 11-2004
|
Sam, your posts are good. But don't wait 5 years. Get some decent brake pads, flush the brake fluid, pump your tyres up to maybe 40-45 PSI and go do a track day.
You don't have to be ultra competitive to have some fun.
Then if you like it, consider getting some second hand wheels and a set of tyres for track use to save your normal ones and get more grip.
If it's just a cost issue though, shaving a few thousand k's off the life of your street tyres is still pretty good value compared to the cost of having track wheels.
I did a handful of track days on my street tyres, was good fun and didn't make that much of a mess of them. Perhaps one advantage was that because they didn't have extreme grip, I had to be a bit more cautious in the corners and they let go more gently. Good training for road driving anyway. |
Sam Koek
TryHard
VICTORIA
2.5GT-T Manual
Posts: 170
Reg: 08-2005
|
peter, i believe you are very expert of soarer, do you know what is the maxinum top speed the TT soarer can go? In USA the SC300's dashboard is different from our soarer, they use normal one, and it show 260km/h is the top speed, so is that the top speed i will get if i change my ECU? |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 5966
Reg: 11-2004
|
Typically Soarers can get to around 240-250kph in stock trim, more if modified, but you will probably not get that on a track due to the long run up required. Unless you can find a track with very long straights.  |
Callum Finch
Goo Roo
WA
Soarer TT & Corolla
Posts: 1924
Reg: 09-2005
|
Wouldnt you still be limited by how much you can get through the gearbox ratio wise?
Like, say the average stock TT Soarer gets 200rwhp and 250kph top speed. Could a Soarer with say 350rwhp do over 300kph? |
Dan McColl
Goo Roo
Victoria
UZZ 32 V8 Soarer #138
Posts: 1327
Reg: 07-2005
|
Yes Callum. It depends on power and gear ratio's.
It is also a law of diminishing returns type thing. To double the speed will require about 4 times the power plus a bit.
All stock soarers can only do 180 km/h. If it goes faster than this it has been modified. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 5969
Reg: 11-2004
|
The problem is that the faster you go, you get more wind resistance which needs more power to overcome.
Peter Scott had his V8 redlined at 284 km/hr - about 6490 rpm, but that was on jacks - no wind resistance. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 5970
Reg: 11-2004
|
Dan, I guess that makes the speed cut device the best bang for buck.
"Increase your top speed from 180kph to 240kph for only $200*, no other mod for any price can give you an extra 60kph!"
* What my RSM cost.
|
Matthew Sharpe
Goo Roo
North Island
JZZ31
Posts: 1580
Reg: 10-2005
|
Peter Nitschke wrote on Wednesday, September 27, 2006 - 06:02 am:Peter Scott had his V8 redlined at 284 km/hr - about 6490 rpm, but that was on jacks - no wind resistance.
Not to mention tyre friction, which becomes quite significant at those speeds also. |
Callum Finch
Goo Roo
WA
Soarer TT & Corolla
Posts: 1934
Reg: 09-2005
|
Jacks?
Soarers are a big lump of a car, so i can see how higher speeds would be difficult from a wind resistance point of view.
....wait isnt that why my mirrors fold back?
¬_¬ |
Dave Hart
DieHard
Waikato
UZZ32
Posts: 797
Reg: 08-2005
|
Don't Soarers have a CD factor of .29, which would make them very slippery regardless of weight? |
Sam Koek
TryHard
VICTORIA
2.5GT-T Manual
Posts: 172
Reg: 08-2005
|
i want to know, if i want my car run 12sec or 11sec in 1/4 miles, stock 180kph is enought? With stock limit 180kph, how many second can achieve? i mean the maxinum. |
David Vaughan
Goo Roo
ACT
V8 Ltd manual
Posts: 2517
Reg: 07-2005
|
Weight is immaterial to slipperiness. Frontal area matters as well as Cd. I expect that the factory Cd claim was tested with 215 tyres so any car here would be worse, and wider tyres would have more friction (as Matthew said) as well. Also, keep the parking pole down and probably remove the rear spoiler, any body kit, enlarged FMIC and even a BFI. |
Maurice Diggler
TryHard
Victoria
Twin Turbo
Posts: 278
Reg: 06-2006
|
Sam Koek wrote on Wednesday, September 27, 2006 - 07:49 pm:With stock limit 180kph, how many second can achieve? i mean the maxinum.
The maximum eh, maybe a 25sec 1/4? |
Cihan Aday
Goo Roo
Its stock i swear.
JZZ30
Posts: 1359
Reg: 07-2005
|
1/4 what?
Sam, you'd need a very fast 60ft and quick acceleration after that to break the 11's under 113mph (~180kph) buddy. |
Daniel Clarke
DieHard
NSW
TT 2.5L 6 cylinder
Posts: 632
Reg: 03-2006
|
I ran 12.9 @ 173 km/h with a 1.89 60 footer. Thats putting close to 200rwkw @ 15psi. Im guessing with 225-230rwkw I'd be pushing 12.5's and 178-184km/h so until then, it wont be a problem. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 5984
Reg: 11-2004
|
David Vaughan wrote on Wednesday, September 27, 2006 - 07:52 pm: remove the rear spoiler
The factory spoiler is supposed to reduce drag slightly as it does the job it is designed to do. |
Matthew Sharpe
Goo Roo
North Island
JZZ31
Posts: 1589
Reg: 10-2005
|
Yeah, I think its .30 with, .33 without or something close to that anyway. |
David Vaughan
Goo Roo
ACT
V8 Ltd manual
Posts: 2521
Reg: 07-2005
|
That is why I said "probably" Peter. Some spoilers are designed to reduce drag by cleaning up the air flow around the tail, some increase both downforce and drag, and some increase drag while doing nothing useful except for the owner's ego . I have never read comparative figures for the Soarer so I do not know their result. If it is drag-reducing, then I do not feel so bad about having one on my car. |
Peter Nitschke
Junk Filterer
South Australia
GT4.0 V8
Posts: 5989
Reg: 11-2004
|
From what I have seen in my rear view mirror, it appears that without a spoiler I throw up a bit more of a rooster tail when driving in the wet than a Soarer I was following that had a spoiler.
It's pretty hard to tell though, the best thing would be to have a 3rd car following to look at the spray patterns. |
Michael Machin
Tinkerer
Franklin
UZZ31
Posts: 73
Reg: 07-2006
|
From memory it is without spoiler Cd .30, with spoiler Cd .29 |
Don Bagnall
Moderator
New Zealand
I have WAY less Soarers than Hayden :-(
Posts: 4721
Reg: 05-2005
|
Details! Details!...........Enough with the details already!!!  |
Maurice Diggler
TryHard
Victoria
Twin Turbo
Posts: 282
Reg: 06-2006
|
Michael... lower CD being better? If so, rear spoiler FTW! |
David Vaughan
Goo Roo
ACT
V8 Ltd manual
Posts: 2527
Reg: 07-2005
|
Thanks Michael 
Edit: Peter's rooster test is obviously brilliant  |
Sam Koek
TryHard
VICTORIA
2.5GT-T Manual
Posts: 173
Reg: 08-2005
|
sorry guys, what is mean 'CD'? |
David Vaughan
Goo Roo
ACT
V8 Ltd manual
Posts: 2529
Reg: 07-2005
|
CD is a compact disc. Cd is Coefficient of Drag.
A number (dimensionless?) which you multiply by frontal area to get a number representing total drag. A large car and a small car can have the same Cd (in fact, the larger car's is quite likely to be lower) but the smaller car will have less total drag unless its Cd is awful. |
Michael Machin
Tinkerer
Franklin
UZZ31
Posts: 76
Reg: 07-2006
|
Maurice Diggler wrote on Thursday, September 28, 2006 - 06:53 pm:Michael... lower CD being better? If so, rear spoiler FTW!
Yes, lower is better. The way the Soarer's spoiler works is it detaches the airflow from the car, eliminating turbulence at the back, which is very bad (it can cause lift). Peter's rooster tail sounds to be indicative of that.
This pic shows how a bootlid spoiler on a wagon detaches the airflow neatly.
http://www.autospeed.com/cms/A_3058/article.html |
Sam Koek
TryHard
VICTORIA
2.5GT-T Manual
Posts: 176
Reg: 08-2005
|
Thanks for your explanation guys! |
David Vaughan
Goo Roo
ACT
V8 Ltd manual
Posts: 2536
Reg: 07-2005
|
quote:This pic shows how a bootlid spoiler on a wagon detaches the airflow neatly
Bloody advertising |
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